New PPK,the decock/safety not decocking.It worked fine NIB,then 50 rounds into first range trip it dropes hammer half way.I thought it was just new and stiff,figured after I cleaned & lubed it would be OK,It's doing the same thing.The hammer dropes half way.The safety has been stiff even when the decocking worked properly.I can send back to MFG.but hate to if it is something simple. Any suggestions? The gun works great other than this issue.